After college, Ikeda played for Yawata Seitetsu in the industrial leagues. He made his debut with Hiroshima in 1962, going 16-16 with a 2.44 ERA as a workhorse (27 starts, 30 relief appearances). He had a 21-13, 2.57 record in 1963 and was 5th in the Central League in ERA then fell to 15-12, 3.10 in 1964 and 13-17, 3.15 in 1965. In '65, he gave up 26 home runs, leading the CL.

Ikeda was 16-12 with a 2.77 ERA and .228 opponent average in 1966. He tied Makoto Inagawa for the league lead in gopher balls, with 20. The right-hander was hit on the wrist by a line driver during workouts early in 1967 and never recovered; he had a 1-5, 2.81 record in nine games that season. He was 1-5 with a 4.78 ERA and .299 opponent average in 11 games (3 starts) in 1968 and was 0-2 with a 2.25 ERA in 13 relief appearances in 1969.

Overall, Hidetoshi went 83-82 with a 2.83 ERA and .233 opponent average in 251 career games (172 starts). He later was a coach for both the Taiyo Whales and Chunichi Dragons and a commentator for Chugoku Broadcasting. He also worked in public relations at Hiroshima Kogyo University.